Autolite XS4163 Xtreme Sport Iridium Powersports Spark Plug, Pack of 1 Designed for motorcycles, ATV's, jet skies, boats, and snowmobiles .6mm finewire design with sport V-trim ground electrode provides more horsepower than a standard plug and better fuel efficiency than a worn plug Up to 26 percent quicker engine starts than leading standard plugs providing less battery/starter wear and less kick-starting effort required for dirt bikes More focused ignition to prevent fouling, for reliable starting in any season or weather condition Meets or exceeds OE (Original Equipment) design